Charles h



I (Medel.) F

" "G, ILKOYL.

i `l yLATBFoRs'EGoNDARY BATTERIES.

No.2765974f Patented May 1,1883.

r44 PETERS. Pmwumugmpm. wnningum ma UNITED [STATES PATENT OEEICE.1

CHARLES IEIJKOYL, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE AMERI- CAN ELEOTBOIHORE COMPANY, OF jWASHINGTON, D. C.

PLATE FOR SECONDARY BATTERIES.

SPECIFICATION forming part of Letters Patent No. 276,974, dated May 1, 1883.

- Application filed January 10, 1883. (Specimens.)

To all whom it may concern:

c Be it known that `LCRARLES H. KoYL, of Baltimore, in the State of Maryland, have invented certain new and useful Improvements 5 inithe Manufacture of Plates for Secondary Batteries, of which the followingis a specification, reference being had to the annexed drawing, which represents graphically the composition ot' my improved plate.

1o The plate n which my invention is com- ,prised is a porous plate composed of a hydro-V readily be obtained by running the mixture into' the` form of plates which are baked or carbonized without being preliminarily pressedto an extent which will give them the solidity and denseness` of ordinary carbon plates. The produetthus obtainedisa porous plate throughout which the polarizable substance is in a condition and position to bereached and acted on by the solution, and in which the pores orinterior passages are of such dimensions as to permit the oxidizing action to go on throughout its interior without danger ot breaking up or rupturing it.` i

One way in which I have practiced making the plateis as follows: Take coal-tar in a Huid state, or thereabouts, and a polarizable substance-such as red lead or other form of lead in a finely-dividedcondition-using in onebnndred parts, say, from sixty to eighty parts, by weight, of the lead, andthoroughly `and inti t mately mix these two substances together.

already of liquidconsstency, can, by application of moderate heat, be brought to that condition sufticiently to permit it tofbe run into a `mold of the shape.` required for the plate; or,

1 if the mixture be of` pasty consistency, it can i 5o be put into the mold and brought into shape Thereis thusobtained a mixture which, if not t to till the same properly by suitable means, care being taken in so doing not to subject the t c mixture to pressure of any great extent. The interior of the mold is ot' course preliminarly greased, as usual, to prevent sticking, and, 55

`After this'operation the plate is taken out from the mold, and its faces are preferably ground t off' so as to remove the surface film, after which 65 it is ready for use. The eilect of the baking.. Voperation on the red lead is to reduce it to the form of metallic lead, which is in a nelydivided condition,and is disseminated throughout the plate. The carbon body of the `plate 7o has avery porous structure, with large pores or passages, which admit the battery solution to the interior of the plate,\which in factis percolated by the liquid. y

Experience has demonstrated that plates of 5 75 this kind are formed and charged with great expedition, and that they are very efficient and have a relatively high storage capacity.

What I claim as new and of my invention 1s 1. A porous carbonized plate for secondary batteries, composed primarily ot' a mixture of a hydrocarbon and a finely-divided polarizable substance, baked together, substantially as hereinbefore set forth. 8 5

2. The improvement in the art of making plates for secondary batteries, consisting in mixing finely-divided lead or other polariza- `ble substance and coal-tar or other hydrocarbon base, in substantially the proportions A9o stated, forming the mixture into plates, and then carbonizing or baking the same, substantially as hereinbef'ore set forth.

In testimony whereof I have hereunto set `my hand this 8th day of January, `1883..

CHARLES E. Korn 

